Calf exerciser



FIG. 1 is a perspective view of the calf exerciser;

FIG. 2 is a top view of the calf exerciser of FIG. 1;

FIG. 3 is a bottom view of the calf exerciser of FIG. 1;

FIG. 4 is a front elevational view of the calf exerciser of FIG. 1, with the rear elevational view being a mirror image thereof; and,

FIG. 5 is an end view of the calf exerciser of FIG. 1, with the opposite end view being a mirror image thereof. 

The ornamental design for a calf exerciser, as shown and described. 